Hostname: page-component-745bb68f8f-v2bm5 Total loading time: 0 Render date: 2025-02-10T21:03:50.815Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Iron Substitution on the High-temperature Properties of Sm(Co,Cu,Ti)z Permanent Magnets

Published online by Cambridge University Press:  21 March 2011

Jian Zhou ,
Ralph Skomski ,
David J. Sellmyer ,
Wei Tang  and
George C. Hadjipanayis
Jian Zhou
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
Ralph Skomski
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
David J. Sellmyer
Affiliation:
Department of Physics and Astronomy and Center for Materials Research and AnalysisUniversity of Nebraska, Lincoln, NE 68588
Wei Tang
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716
George C. Hadjipanayis
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716
Get access

Abstract

Recently, Ti-substituted Sm-Co permanent magnets have attracted renewed attention due to their interesting high-temperature coercivity. Our presentation deals with the effect of iron substitutions on the magnetic properties of the materials. X-ray diffraction shows that the investigated Sm(Co,Fe,Cu,Ti)z materials (z = 7.0 - 7.6) are two-phase magnets, consisting of 1:5 and 2:17 regions. The iron content affects both the coercivity and the magnetization. Depending on composition and heat treatment, some samples show a positive temperature coefficient of the coercivity in the temperature range from 22 °C to 550 °C. Moderate amounts of iron enhance the room-temperature coercivity. For example, the room-temperature coercivity of Sm(Co6.0Fe0.4Cu0.6Ti0.3) is 9.6 kOe, as compared to 7.6 kOe for Sm(Co6.4Cu0.6Ti0.3). At high temperatures, the addition of Fe has a deteriorating effect on the coercivity, which is as high as 10.0 kOe at 500 °C for Sm(Co6.4Cu0.6Ti0.3). The room-temperature magnetization increases on iron substitution, from 73 emu/g for Sm(Co6.4Cu0.6Ti0.3) to 78 emu/g for Sm(Co6.0Fe0.4Cu0.6Ti0.3). The observed temperature dependence is ascribed to the preferential dumbbell-site occupancy of the Fe atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , U2.3
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Chen, Christina H., Walmer, Marlin S., Walmer, Michael H., Liu, Sam, Kuhl, G. Edward, and Simon, Gerard K., Advanced hard and soft magnetic materials, edited by Coey, M. et al. (Mater. Res. Soc. Proc. 577, San Francisco, CA 1999) pp.277–287.Google Scholar
2. Liu, J. F., Ding, Y., and Hadjipanayis, G. C., J. Appl. Phys. 85, 1670 (1999).Google Scholar
3. Zhou, J., Skomski, R., Chen, C., Hadjipanayis, G. C., and Sellmyer, D. J., Appl. Phys. Lett. 77, 1514 (2000).Google Scholar
4. Zhou, J., Skomski, R., and Sellmyer, D. J., IEEE Trans. Magn., 37, (2001) (in press).Google Scholar
5. Ray, A. E., J. Appl. Phys. 55, 2094 (1984).Google Scholar
6. Kumar, Kaplesh, J. Appl. Phys. 63, R13 (1988).Google Scholar